1 | // SPDX-License-Identifier: GPL-2.0 |
2 | #include <linux/bpf.h> |
3 | |
4 | #include <bpf/bpf_helpers.h> |
5 | |
6 | struct { |
7 | __uint(type, BPF_MAP_TYPE_PROG_ARRAY); |
8 | __uint(max_entries, 3); |
9 | __uint(key_size, sizeof(__u32)); |
10 | __uint(value_size, sizeof(__u32)); |
11 | } jmp_table SEC(".maps" ); |
12 | |
13 | int selector = 0; |
14 | |
15 | #define TAIL_FUNC(x) \ |
16 | SEC("tc") \ |
17 | int classifier_##x(struct __sk_buff *skb) \ |
18 | { \ |
19 | return x; \ |
20 | } |
21 | TAIL_FUNC(0) |
22 | TAIL_FUNC(1) |
23 | TAIL_FUNC(2) |
24 | |
25 | SEC("tc" ) |
26 | int entry(struct __sk_buff *skb) |
27 | { |
28 | int idx = 0; |
29 | |
30 | if (selector == 1234) |
31 | idx = 1; |
32 | else if (selector == 5678) |
33 | idx = 2; |
34 | |
35 | bpf_tail_call(skb, &jmp_table, idx); |
36 | return 3; |
37 | } |
38 | |
39 | char __license[] SEC("license" ) = "GPL" ; |
40 | |